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dwdm: Definition and Recommended Links

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In fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes multiple optical carrier signals on a single optical fiber by using different wavelengths (colours) of laser light to carry different signals. This allows for a multiplication in capacity, in addition to enabling bidirectional communications over one strand of fiber. 'This is a form of frequency division multiplexing (FDM) but is commonly called wavelength division multiplexing.'[1]

The term wavelength-division multiplexing is commonly applied to an optical carrier (which is typically described by its wavelength), whereas frequency-division multiplexing typically applies to a radio carrier (which is more often described by frequency). However, since wavelength and frequency are inversely proportional, and since radio and light are both forms of electromagnetic radiation, the two terms are equivalent.

Source: Wikipedia (http://en.wikipedia.org/wiki/DWDM)

other great electronics sites:ee toolbox site

• • dwdm
    • In fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes multiple optical carrier signals on a single optical fiber by using different wavelengths (colours) of laser light to carry different signals. This allows for a multiplication in capacity, in addition to enabling bidirectional communications over one strand of fiber. 'This is a form of frequency division multiplexing (FDM) but is commonly called wavelength division multiplexing.'[1]

      The term wavelength-division multiplexing is commonly applied to an optical carrier (which is typically described by its wavelength), whereas frequency-division multiplexing typically applies to a radio carrier (which is more often described by frequency). However, since wavelength and frequency are inversely proportional, and since radio and light are both forms of electromagnetic radiation, the two terms are equivalent.

      Source: Wikipedia (http://en.wikipedia.org/wiki/DWDM)

      (Note: The Electronic Engineers Toolbox provides an alternative set of featured links for this word at http://www.cera2.com/dwdm.htm)

      Featured Links:

      Optical Networking And Dense Wavelength Division Multiplexing (DWDM)

      This paper deals with the twin concepts of optical networking and dense wavelength division multiplexing. The paper talks about the various optical network architectures and the various components of an all-optical network like Optical Amplifiers, Optical Add/Drop Multiplexors, Optical Splitters etc. Important optical networking concepts like wavelength routing and wavelength conversion are explained in detail. Finally this paper deals with. . .
      http://www.cse.wustl.edu/~jain/cis788-99/ftp/dwdm/index.html

      Dense Wavelength Division Multiplexing (DWDM) Performance and Conformance Testing

      Dense wavelength division multiplexing (DWDM) is a technology that uses multiple lasers to transmit many wavelengths of light simultaneously over a single optical fiber. Each signal is modulated by different source data (text, voice, video, etc.) and travels within its own unique color band (wavelength). DWDM enables the existing fiber infrastructure of the telephone companies and other carriers to be dramatically increased.
      http://www.iec.org/online/tutorials/dwdm_perf/

      Hot Topics in Networking: Voice Over IP, DWDM, Ethernet

      Very good list of links from a major professor in Network technologies - Networking History and Trends References Quality of Service over IP References Label Switching References Gigabit Ethernet References Storage Area Networks References IP over DWDM References Wireless Data Networks References Voice over IP References A list of references on additional topics
      http://www.cse.wustl.edu/~jain/refs/hot_refs.htm

      Dense Wavelength Division Multiplexing (DWDM) Testing

      At its simplest, a dense wavelength division multiplexed (DWDM) system can be viewed as a parallel set of optical channels, each using a slightly different light wavelength, but all sharing a single transmission medium. This new technical solution can increase the capacity of existing networks without the need for expensive recabling and can significantly reduce the cost of network upgrades.
      http://www.iec.org/online/tutorials/dwdm_test/

      DWDM Components Original study plus update

      This market research report and update by IGI Consulting forecasts the market for optical components to be flat or decreasing for 2001 but will pick up its growth in 2002. Even though most aspects of the market are showing little or no growth, photonics automation and integrated optics are still showing growth. Feb 2001 Study.
      http://www.igigroup.com/st/pages/dwdmcomp.html

      WDM Technologies: Optical Networks

      This revolutionary capability is being achieved with technology known as wavelength division multiplexing WDM). WDM technology relies on the fact that optical fibers can carry many wavelengths of light simultaneously without interaction between each wavelength. Thus, a single fiber can carry many separate wavelength signals or channels simultaneously.
      http://www.amazon.com

      Application of Dense Wavelength Division Multiplexing in Metropolitan Transport Networks

      This paper introduces some of the factors underlying the deployment of Dense Wavelength Division Multiplexing (DWDM) in metropolitan ring networks. DWDM has been implemented previously in point-to-point trunk networks but advances in opto-electronics, enabling the production of the more diverse DWDM components at much lower cost, has now made the technology a viable option for increasing the transmission capacity in metropolitan networks.
      http://www.ee.ucl.ac.uk/lcs/papers99/dbojic.pdf

      Dense Wavelength Division Multiplexing (DWDM) Tutorial

      This tutorial addresses the importance of scalable DWDM systems in enabling service providers to accommodate consumer demand for ever-increasing amounts of bandwidth. DWDM is discussed as a crucial component of optical networks that allows the transmission of e-mail, video, multimedia, data, and voice carried in Internet protocol (IP), asynchronous transfer mode (ATM), and synchronous optical network/synchronous digital hierarchy (SONET/SDH)...
      http://www.iec.org/online/tutorials/dwdm/

      Dense Wavelength Division Multiplexing (DWDM) Performance and Conformance Testing

      Dense wavelength division multiplexing (DWDM) is a technology that uses multiple lasers to transmit many wavelengths of light simultaneously over a single optical fiber.
      http://www.onforum.com/tutorials/acrobat/dwdm_perf.pdf

      Setting A New Standard for Bandwidth

      This cutting edge technology - when combined with network management systems and add-drop multiplexers - enables carriers to adopt optically-based transmission networks that will meet the next generation of band-width demand at a significantly lower cost than installing new fiber.
      http://www.urec.cnrs.fr/hd/DWDM/CIENA/dwdm_ciena.pdf

      Explanation: these links are provided as part of our EE glossary project, which seeks to identify the most prominent keywords in embedded systems, embedded software, realtime and rtos, dsp (digital signal processing), system-on-a-chip, microprocessors and microcontrollers, and other constituent elements for embedded systems. While we seek to keep most of the links up-to-date, the user is refered to other primary electronic-based search sites such as: cera2.com, embedded.com, or EDN Magazine. If you have any suggestions of links or definitions, please email!

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